Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A downstream transceiver circuit for receiving and transmitting respectively forward channel and back channel data signals conveyed simultaneously as a composite data signal via a common conductor pair terminated at a downstream end with respective downstream coupling capacitors, comprising: downstream transceiver circuitry including a downstream signal path coupled to the downstream end of the conductor pair through the downstream coupling capacitors, including a forward channel receiver configured to receive over the downstream signal path forward channel data signals at a forward channel frequency, and a back channel driver configured to transmit over the downstream signal path back channel data signals at a back channel frequency, wherein the forward channel frequency is substantially greater than the back channel frequency; and the downstream transceiver circuitry further including: in the downstream signal path, respective filter capacitors coupled between respective downstream coupling capacitors and the forward channel receiver, with the filter capacitors having a capacitance value substantially less than that of the downstream coupling capacitors; and a replica signal driver coupled to the downstream signal path downstream from the filter capacitors between the filter capacitors and an input to the forward channel receiver, and configured to generate back channel replica signals corresponding to an inverse of the back channel data signal; wherein the back channel driver is coupled to the downstream signal path upstream from the filter capacitors between the filter capacitors and the downstream coupling capacitors; such that signal components corresponding to the back channel data signals are significantly reduced at the input to the forward channel receiver.
A downstream transceiver circuit allows simultaneous two-way communication (forward and back channels) over a single wire pair. It uses coupling capacitors to connect to the wire. The circuit includes a receiver for the forward channel (high-frequency) and a driver for the back channel (low-frequency). Filter capacitors (smaller than the coupling capacitors) are placed in the signal path before the receiver. A "replica" signal driver generates an inverted copy of the back channel signal and injects it into the signal path *after* the filter capacitors but *before* the receiver input. This inverted signal cancels out the back channel signal leaking through, preventing interference with the forward channel receiver. The back channel driver transmits its signal *before* the filter capacitors.
2. The circuit or claim 1 , wherein the filter capacitors and the replica signal driver are cooperatively configured to minimize signal components of the back channel data signals at the input to the forward channel receiver.
The downstream transceiver circuit described previously, which allows simultaneous two-way communication (forward and back channels) over a single wire pair, uses filter capacitors and a replica signal driver in combination. These components are tuned to minimize the unwanted back channel signal components that might otherwise interfere with the forward channel receiver. This cooperative configuration optimizes the cancellation of back channel noise.
3. The circuit of claim 1 , wherein the back channel driver comprises back channel differential amplifier circuitry, and the replica signal driver comprises replica differential amplifier circuitry.
The downstream transceiver circuit described previously, which allows simultaneous two-way communication (forward and back channels) over a single wire pair, uses differential amplifier circuitry for both the back channel driver and the replica signal driver. This means instead of single ended amplifiers it uses a differential amplifier which outputs based on the difference between two signals.
4. The circuit of claim 3 , wherein the replica differential amplifier circuitry includes at least one transistor scaled relative to a corresponding at least one transistor of the back channel differential amplifier circuitry, thereby reducing back channel data signal components at the input to the forward channel receiver.
The downstream transceiver circuit described previously, which allows simultaneous two-way communication (forward and back channels) over a single wire pair, incorporates differential amplifier circuitry for both the back channel driver and a replica signal driver. To further reduce back channel interference, at least one transistor within the replica amplifier is sized differently compared to its corresponding transistor in the back channel amplifier. This "scaling" adjusts the strength of the replica signal, improving cancellation of the back channel signal at the forward channel receiver's input.
5. The circuit of claim 3 , wherein the replica differential amplifier circuitry includes load resistors scaled relative to corresponding load resistors of the back channel differential amplifier circuitry, thereby reducing replica signal driver currents relative to back channel driver currents.
The downstream transceiver circuit described previously, which allows simultaneous two-way communication (forward and back channels) over a single wire pair, incorporates differential amplifier circuitry for both the back channel driver and a replica signal driver. The load resistors in the replica signal amplifier are scaled differently than those in the back channel amplifier. This scaling reduces the current in the replica amplifier relative to the back channel driver, optimizing the subtraction of the back channel signal component.
6. The transceiver communication system of claim 3 , wherein the replica differential amplifier circuitry includes load resistors scaled relative to corresponding load resistors of the back channel differential amplifier circuitry, thereby reducing replica signal driver currents relative to back channel driver currents.
The transceiver communication system described previously, which allows simultaneous two-way communication (forward and back channels) over a single wire pair, incorporates differential amplifier circuitry for both the back channel driver and a replica signal driver. The load resistors in the replica signal amplifier are scaled differently than those in the back channel amplifier. This scaling reduces the current in the replica amplifier relative to the back channel driver, optimizing the subtraction of the back channel signal component.
7. A transceiver communication system for receiving and transmitting respectively forward channel and back channel data signals conveyed simultaneously as a composite data signal via a common conductor pair terminated at an upstream end and a downstream end by respective upstream and downstream coupling capacitors, comprising: an upstream transceiver and a downstream transceiver coupled respectively through the upstream and downstream coupling capacitors respectively to the upstream and downstream ends of the conductor pair; the upstream transceiver circuitry including a forward channel driver and a back channel receiver respectively configured to transmit forward channel data signals and receive back channel data signals conveyed over the conductor pair as the composite data signal; the downstream transceiver circuitry including a downstream signal path coupled to the downstream end of the conductor pair through the downstream coupling capacitors, including a forward channel receiver configured to receive over the downstream signal path forward channel data signals at a forward channel frequency, and a back channel driver configured to transmit over the downstream signal path back channel data signals at a back channel frequency, wherein the forward channel frequency is substantially greater than the back channel frequency; and the downstream transceiver circuitry further including: in the downstream signal path, respective filter capacitors coupled between respective downstream coupling capacitors and the forward channel receiver, with the filter capacitors having a capacitance value substantially less than that of the downstream coupling capacitors; and a replica signal driver coupled to the downstream signal path downstream from the filter capacitors between the filter capacitors and an input to the forward channel receiver, and configured to generate back channel replica signals corresponding to an inverse of the back channel data signal; wherein the back channel driver is coupled to the downstream signal path upstream from the filter capacitors between the filter capacitors and the downstream coupling capacitors; such that signal components corresponding to the back channel data signals are significantly reduced at the input to the forward channel receiver.
A two-way communication system transmits data simultaneously in both directions (forward and back channels) over a single wire pair. Coupling capacitors connect the transceivers to the wire at each end. The upstream transceiver sends the forward channel and receives the back channel. The downstream transceiver circuit contains a forward channel receiver (high frequency) and a back channel driver (low frequency). Filter capacitors (smaller than the coupling capacitors) are placed in the signal path before the downstream receiver. A "replica" signal driver generates an inverted copy of the back channel signal and injects it into the signal path *after* the filter capacitors but *before* the receiver input. The back channel driver transmits its signal *before* the filter capacitors. This inverted signal cancels out the back channel signal leaking through, preventing interference with the forward channel receiver.
8. The transceiver communication system of claim 7 , wherein the filter capacitors and the replica signal driver are cooperatively configured to minimize signal components of the back channel data signals at the input to the forward channel receiver.
The two-way communication system described previously, which sends data simultaneously using forward and back channels, uses filter capacitors and a replica signal driver in combination. These components are tuned to minimize the unwanted back channel signal components that might otherwise interfere with the forward channel receiver at the downstream end. This cooperative configuration optimizes the cancellation of back channel noise.
9. The transceiver communication system of claim 7 , wherein the back channel driver comprises back channel differential amplifier circuitry, and the replica signal driver comprises replica differential amplifier circuitry.
The two-way communication system described previously, which sends data simultaneously using forward and back channels, uses differential amplifier circuitry for both the back channel driver and the replica signal driver in the downstream transceiver. This means instead of single ended amplifiers it uses a differential amplifier which outputs based on the difference between two signals.
10. The transceiver communication system of claim 9 , wherein the replica differential amplifier circuitry includes at least one transistor scaled relative to a corresponding at least one transistor of the back channel differential amplifier circuitry, thereby reducing back channel data signal components at the input to the forward channel receiver.
The two-way communication system described previously, which sends data simultaneously using forward and back channels, uses differential amplifier circuitry for both the back channel driver and a replica signal driver in the downstream transceiver. To further reduce back channel interference, at least one transistor within the replica amplifier is sized differently compared to its corresponding transistor in the back channel amplifier. This "scaling" adjusts the strength of the replica signal, improving cancellation of the back channel signal at the forward channel receiver's input.
11. A method of receiving and transmitting respectively forward channel and back channel data signals conveyed simultaneously as a composite data signal via a common conductor pair terminated at a downstream end with respective downstream coupling capacitors, comprising: configuring a downstream signal path coupled to the downstream end of the conductor pair through the downstream coupling capacitors, and including respective filter capacitors, with the filter capacitors having a capacitance value substantially less than that of the downstream coupling capacitors; receiving, over the downstream signal path, forward channel data signals at a forward channel frequency, input to a forward channel receiver; and transmitting, over the downstream signal path, back channel data signals at a back channel frequency, generated by a back channel driver; wherein the forward channel frequency is substantially greater than the back channel frequency; generating back channel replica signals corresponding to an inverse of the back channel data signals; and coupling the back channel data signals into the downstream signal path upstream from the filter capacitors between the filter capacitors and the downstream coupling capacitors, and coupling the replica data signals into the downstream signal path downstream from the filter capacitors between the filter capacitors and an input to the forward channel receiver; such that signal components corresponding to the back channel data signals are significantly reduced at the input to the forward channel receiver.
A method for simultaneous two-way communication (forward and back channels) over a single wire involves the following steps at the downstream end: Configure a signal path with filter capacitors (smaller than coupling capacitors) before the forward channel receiver. Receive the forward channel signal (high-frequency). Transmit the back channel signal (low-frequency) using a back channel driver. Generate an inverted replica of the back channel signal. Inject the back channel signal into the signal path *before* the filter capacitors, and the inverted replica signal *after* the filter capacitors, but *before* the forward channel receiver. This cancels out the back channel signal and minimizes interference.
12. The method or claim 11 , wherein the back channel replica signals are generated by a replica signal driver, and wherein the filter capacitors and the replica signal driver are cooperatively configured to minimize signal components of the back channel data signals at the input to the forward channel receiver.
The method for simultaneous two-way communication previously described, which sends data simultaneously using forward and back channels, uses a replica signal driver to generate the inverted back channel signal. The filter capacitors and this replica driver are used together to minimize interference with the forward channel receiver, improving signal quality.
13. The method of claim 11 , wherein the back channel driver comprises back channel differential amplifier circuitry, and wherein the back channel replica signals are generated by replica differential amplifier circuitry.
The method for simultaneous two-way communication previously described, which sends data simultaneously using forward and back channels, uses differential amplifier circuitry for the back channel driver. The inverted back channel signal is generated by replica differential amplifier circuitry.
14. The method of claim 13 , wherein the replica differential amplifier circuitry includes at least one transistor scaled relative to a corresponding at least one transistor of the back channel differential amplifier circuitry, thereby reducing back channel data signal components at the input to the forward channel receiver.
The method for simultaneous two-way communication previously described, which sends data simultaneously using forward and back channels, uses differential amplifier circuitry for both the back channel driver and the replica signal generator. At least one transistor within the replica amplifier is sized differently compared to its corresponding transistor in the back channel amplifier. This "scaling" optimizes the cancellation of the back channel signal at the forward channel receiver's input.
15. The method of claim 13 , wherein the replica differential amplifier circuitry includes load resistors scaled relative to corresponding load resistors of the back channel differential amplifier circuitry, thereby reducing replica signal driver currents relative to back channel driver currents.
The method for simultaneous two-way communication previously described, which sends data simultaneously using forward and back channels, uses differential amplifier circuitry for both the back channel driver and the replica signal generator. The load resistors in the replica signal amplifier are scaled differently than those in the back channel amplifier, reducing the current of the replica signal and optimizing the cancellation of the back channel signal component.
Unknown
December 30, 2014
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